package main

import (
	"time"
	"fmt"
)

//Go的select可以让等待多个通道的操作
//把goroutines和channel与select结合起来是Go的一个强大功能

func main() {

	c1 := make(chan string)
	c2 := make(chan string)

	go func() {
		time.Sleep(1 * time.Second)
		c1 <- "one"
	}()

	go func() {
		time.Sleep(2 * time.Second)
		c2 <- "two"
	}()

	//使用select同时等待这两个值，并在每个值到达时进行打印。
	for i := 0; i < 2; i++ {
		select {
		case msg1 := <-c1:
			fmt.Println("received", msg1)
		case msg2 := <-c2:
			fmt.Println("received", msg2)
		}
	}
}
